發源於延慶縣西二道河鄉，匯入十三陵水庫，在昌平縣沙河鎮會合北沙河流入沙河水庫。全長15公里，河道寬400-500米，流域面積287.2平方公里。
 | 這是一篇與中國地理相關的小作品。您可以透過編輯或修訂擴充其內容。 |
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